Clamping device



4 Juiy 28,1925.

L. J. WERNER 'CLAMPING DEVICE Filed May 22, 1923 avvoemto'c WM M.

Patented July 28, 1925.

UNITED STATES PATENT or'ncsi.

LEO J. WERNER, OF ARLINGTON, NEW JERSEY, ASSIGNOR TO DUBILIEB CONDENSER &

RADIO CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

CLAMIPING DEVICE.

. Application filed May 22, 192:. Serial No. 04036,;

To all whomitmay concern."

Be it' known that LEO J. WERNER, a citizen of the United States, residingat 134 Morgan Place, Arlington, in the county of Hudson and State of New Jersey, has invented certain newand useful Improvements in Clamping Devices, of which the following is a specification.

This invention relates to means for securing the knob and dial commonly used with electrical devices (particularly radio appa ratus) to its associated shaft or spindle.

In such apparatus it is common practice to mount certain apparatus such as va'riometers and variable condensers upon apanel, and to adjust these devices by means" of knobs positioned on the outside of the mounting panel. Such knobs commonly have associated with them a dial bearing graduations or the like, whereby the adjust ment of the associated devices may be observed. Each of the devices adapted to be so adjusted is commonly provided with a shaft or spindle on which theknob and dial are adapted to be secured. Various means are employed for securing the knob and dial to the shaft, and it is common practice to make the knob and dial integral and secure the same in position with set screws.- When this is done, often the screws work loose or are inaccessible, or the heads of the screws are.

so positioned as to be touched by the hand of the operator; this is objectionable, for several well-known reasons.

Another means of connectin the knob and dial is ,to provide a-collapslble tubular socket adapted to tightly engage the shaftor spindle, this socket being forced inwardly to grip the shaft by some suitable meanssuch as a tapered nut. It is obvious, howi ever, when such means is ample ed that there is a tendency for the dial to s ip in the event the tapered nut becomes loose. Fur-- thermore, it is difficult to initially put sufficient pressure on the tapered nut to cause the collapsible member to tightly grip the shaft.

The object of the present invent on is to provide means for rapidly and positively securing a knob and dial to an instrument shaft or spindle.

Another object is to provide an arrangement whereby afirmer grip, of the knob and dial upon the instrument shaft is possible than heretofore.

A further-"object is to providea means for attaching the knob and dial to a shaft that will not burr the latter and which requires no abnormal upon the kno being secured in position. The accompanying drawings illustrate the invention.

Fig. 1 shows a face view of the knob and dial members mounted upon their associated shaft. i

Fig. 2 shows a knob and dial in central section mounted upon their associated shaft. "The numeral 1 denotes theshaft or spindle of any instrument which itis desired to adjust or control. 2 is a dial and 3 a knob. 2 and 3 may be separate'or made in one piece. For the sake .of illustration, I show and dial when the same are though the may be separate members. se-

cured toget er in any suitable manner.

The knob 3 is co-axial with the dial and extends beyond the forward face thereof.

pressure or strain to be placed Secured in any suitable manner within this forwardly projecting portion is "the metallic member clamp 4 havin a central aperture 5 adapted to receive sha 1'. At substantially rightangles to said central aperture is aslot 6 which extends across the aperture 5 as shown in the drawing. The block 4 is almost out in half by the slot 6, but hole 5 is in alignment in both portions thereof. The extent of the slot is shown by dotted line 10, Fig. 1. The end 7 of the block 4 has a threaded hole 11 to receive the screw means 8 which passes through a hole in the other end of the clamp' 4 as shown.

The knob 3 is provided with an aperture 9 which registers with the screw 8 whereby the screw may be turned. That portion of the clamp 4 through which the body of the screw passes is bored out to accommodate same, so that the head of the screw, bearing on the clamp, will draw the clamp together to close slot 6.

The complete assembl consisting of the .8 securely clamps t dial when east) may be placed upon the shaft, and secured tightly thereon by turning screw 8. The shalt 1 passing through both portions of the clamp is ripped between them at many points, as sit or recess '6 is closed. goinching or binding action I find very efiectual in securing the knob and olial in position on the shaft without ,burrin or marking the latter. Furthermore, a re atively slight tension on the screw e parts in place, the clamping action being far more efi'ective to hold the arts to ether than any set screw or collapsible tubular gripping arrangement. All metal parts being within or below the surface of the lmob do not come in contact with the hands of the operator and therefore troubles from this source areeliminated.

There is no strain on an of the moulded 20 insulating parts, so troub e heretofore met isomer with from breakage of these parts is obvi= ated.

'I claim:

The combination'ot a knob, a clamp secured to the knob, said clamp comprising a pair of portions se arated by a transverse recess, a bore in the 0 amp, a shaft received. in said. bore and extending across said recess, and screw means passing through one of the portions of the clamp, into engagement with the other portion to draw said portions towards each other and compel them to grip the shaft, thus securing the knob, the clam and; the shaft rigidly together, said lmo having an aperture exposing said means to enable said. means to be operated.

In testimony whereof he has afixed his signature.

LEO J. WERNER. 

